Observations of slug dissipation in downward flow

Detailed observations were made for slug flow in an upward to downward pipe line configuration with 13 capacitance sensors. The results presented in th is study are based on four typical tests, which demonstrate the phenomena e ncountered in slug dissipation. In downward flow, slug frequency decreases with different extent at different flow rates. There is a reduction of slug length after the turning over from upward to downward flow. However, the s lug tends to recover its stable length in further downstream development, e xcept for flow that quickly becomes stratified. Growth of the slug length i s accomplished by picking up liquid left by the downstream dissipating slug before being fully absorbed by the liquid film. [S0195-0738(00)00503-3].